<!DOCTYPE html>

<style type="text/css" media="screen">
  .container {
    display: inline-block;
    width: 200px; 
    height: 200px; 
    overflow: hidden;
    margin: 10px;
    border: 1px solid black;
  }
  
  .inner {
    width: 100%;
    height: 1000px;
    background-color: blue;
  }
  
  .compositing {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 100px;
    height: 100px;
    will-change: transform;
  }
  
  .top {
    height: 50%;
    width: 100%;
    background-color: red;
  }

  .bottom {
    height: 50%;
    width: 100%;
    background-color: green;
  }
</style>
<script type="text/javascript" charset="utf-8">
  if (window.testRunner)
    testRunner.waitUntilDone();

  function doTest()
  {
    window.setTimeout(function() {
     // alert('hi');
      var scrollables = document.querySelectorAll('.container');
      for (var i = 0; i < scrollables.length; ++i) {
        scrollables[i].scrollTop = 500;
      }


      if (window.testRunner)
        testRunner.notifyDone();

    }, 0);
  }

  window.addEventListener('load', doTest, false);
</script>

<!-- Go into compositing. -->
<div class="compositing"></div>

<!-- Test repainting when the graphicsLayer offsetFromRenderer changes -->
<!-- You should see one green square, and no red -->
<div class="container" style="position: relative;">
  <div class="inner" style="position: relative;">
    <div class="top"></div>
    <div class="bottom"></div>
  </div>
</div>